Steuerung der nickel(O)-katalysierten hydrosilylierung von phenylacetylen mit phosphorliganden
| Autor: | Gábor Nagy, Berit Happ, Pál Kvintovics, Tamás Bartik |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Hydrosilylation
Ligand Organic Chemistry chemistry.chemical_element Biochemistry Medicinal chemistry Catalysis Inorganic Chemistry chemistry.chemical_compound Nickel chemistry Phenylacetylene Materials Chemistry Organic chemistry Physical and Theoretical Chemistry Triphenylphosphine Chemoselectivity Selectivity |
| Zdroj: | Journal of Organometallic Chemistry. 453:29-32 |
| ISSN: | 0022-328X |
| Popis: | We report here the first systematic investigation of the effects of concentration and properties of tertiary phosphines on the chemoselectivity of the homogeneous catalytic hydrosilylation of phenylacetylene with triphenylsilane using Nickel(O) catalyst. The presence of P-ligands is necessary to activate the catalytic system. Between the ligand/metal ratio 1/1-2/1 hydrosilylation of phenylacetylene is preferred to trimerisation. The three-dimensional ligand profile showed that phosphines with decreasing bulkiness control the products of hydrosilylation but phosphines with increasing bulkiness yield trimers of acetylene. Hydrosilylation is enhanced when the P-ligand is either more basic or less basic than triphenylphosphine. It was found that tertiary n-alkyl and n-alkoxy-phosphines using a ligand/metal ratio 2/1 in the presence of HSiPh3/P h CCH = 2/1 product 85–90% hydrosilylation selectivity in preference to phenylacetylene. |
| Databáze: | OpenAIRE |
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